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  4. The hydroxyl ion concentration in a solution having pH value 3 will be

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Q. The hydroxyl ion concentration in a solution having $ pH $ value $ 3 $ will be

J & K CETJ & K CET 2019Equilibrium

Solution:

Hydrogen ion concentration of solution having $pH$ value $3=10^{-3}$
Now, $[OH^{-}] [H^{+}] =10^{-14}$
$\Rightarrow [OH^{-}] = \frac{10^{-14}}{[H^{+}]}$
$=\frac{10^{-14}}{10^{-3}}$
$=10^{-11}$